	public function executeIndex(sfWebRequest $request)
	{
		// sorting
		if ($request->getParameter('sort') && $this->isValidSortColumn($request->getParameter('sort')))
		{
			$this->setSort(array($request->getParameter('sort'), $request->getParameter('sort_type')));
		}

		// pager
		$this->setPage($request->getParameter('page') ? $request->getParameter('page') : 1);

		$this->pager = $this->getPager();
		$this->sort = $this->getSort();
	}
